# The Incircle and the Altitudes of a Triangle

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Let ABC be a triangle, AA', BB', and CC' be the altitudes, and the inradius. Then

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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See Theorem 136 in N. Altshiller-Court, *College Geometry*, Mineola, NY: Dover, 2007 p. 79.

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